{"id":6892,"date":"2026-06-22T01:57:08","date_gmt":"2026-06-22T01:57:08","guid":{"rendered":"https:\/\/ic-vendor.com\/smaj33ca\/"},"modified":"2026-06-22T01:57:08","modified_gmt":"2026-06-22T01:57:08","slug":"smaj33ca","status":"publish","type":"post","link":"https:\/\/ic-vendor.com\/zh\/smaj33ca\/","title":{"rendered":"SMAJ33CA"},"content":{"rendered":"

\u4ea7\u54c1\u6982\u89c8<\/h2>\n

The SMAJ33CA from Littelfuse is a 600W bidirectional TVS diode with 33V working voltage and 53.3V clamping voltage in an SMA (DO-214AC) package.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n
\u7c7b\u578b<\/td>\n600W Bidirectional TVS Diode<\/td>\n<\/tr>\n
Peak Pulse Power (PPPM)<\/td>\n600 W @ 10\/1000 us<\/td>\n<\/tr>\n
Working Voltage (VRWM)<\/td>\n33 V<\/td>\n<\/tr>\n
Breakdown Voltage (VBR)<\/td>\n36.7 V (min) ~ 40.6 V (max)<\/td>\n<\/tr>\n
Clamping Voltage (VC)<\/td>\n53.3 V @ IPP=11.3A<\/td>\n<\/tr>\n
Peak Pulse Current (IPP)<\/td>\n11.3 A<\/td>\n<\/tr>\n
Leakage Current (IR)<\/td>\n1 uA (max) @ VRWM<\/td>\n<\/tr>\n
\u914d\u7f6e<\/td>\nBidirectional (CA suffix)<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\nSMA (DO-214AC)<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-55C to +150C<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • 600W peak pulse power dissipation<\/li>\n
  • 33V bidirectional protection<\/li>\n
  • 53.3V clamping voltage at 11.3A<\/li>\n
  • Low 1uA leakage current at working voltage<\/li>\n
  • SMA surface mount package<\/li>\n
  • CA suffix: bidirectional protection<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • 24V\/28V power line transient protection<\/li>\n
    • Industrial control signal line protection<\/li>\n
    • Automotive load dump protection<\/li>\n
    • RS-485 bus ESD\/surge protection<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The SMAJ33CA from Littelfuse is a 600W bidirectional TVS diode with 33V working voltage and 53.3V clamping voltage in an SMA (DO-214AC) package. Key Specifications Type 600W Bidirectional TVS Diode Peak Pulse Power (PPPM) 600 W @ 10\/1000 us Working Voltage (VRWM) 33 V Breakdown Voltage (VBR) 36.7 V (min) ~ 40.6 V […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[19,13],"tags":[],"chip_brand":[200],"class_list":["post-6892","post","type-post","status-publish","format-standard","hentry","category-analog-linear-ics","category-integrated-circuits-ics","chip_brand-littelfuse"],"acf":{"brief_explanation":"TVS Diode, 600W Bi-dir, 33V WM, 53.3V Clamp, SMA","date_code":"","package_case":"SMA \/ DO-214AC (5.2 x 2.6 x 2.1 mm)","in_stock":34567,"datasheet":"https:\/\/www.littelfuse.com\/media?resourcetype=datasheet&itemid=78c49d8e-31c5-4a9e-a0d8-6f0c0b0e5f3b","price":"$0.08 @ 1ku","product_introduction":"The SMAJ33CA from Littelfuse is a 600W bidirectional transient voltage suppression (TVS) diode in an SMA (DO-214AC) surface mount package. The device protects sensitive electronics from voltage transients caused by ESD, EFT, and surge events. The 33V working voltage (VRWM) is suitable for protecting 24V and 28V power rails. The bidirectional configuration (CA suffix) clamps both positive and negative transients, making it ideal for AC signal lines and bidirectional data buses. When the transient voltage exceeds the breakdown voltage (36.7-40.6V), the TVS diode avalanches and clamps the voltage to 53.3V at the peak pulse current of 11.3A. The 600W rating is specified for a 10\/1000us waveform per IEC 61000-4-5. The 1uA maximum leakage current at the working voltage minimizes power consumption in always-on protection circuits.","working_principle":"The SMAJ33CA uses two back-to-back avalanche diodes in a single chip to provide bidirectional voltage clamping. In normal operation, both diodes are reverse-biased at voltages below VRWM (33V), drawing only the specified leakage current (1uA max). When a positive transient exceeds the breakdown voltage (VBR = 36.7-40.6V), one diode avalanches and the other diode conducts in the forward direction. The combined voltage is the clamping voltage (VC = 53.3V at 11.3A). For negative transients, the roles reverse. The avalanche mechanism is a quantum tunneling effect where the high electric field in the depletion region accelerates carriers to energies sufficient to create electron-hole pairs through impact ionization, creating a self-sustaining multiplication that rapidly increases current. The 600W peak pulse power is limited by the thermal mass of the silicon chip and the package, with the energy absorbed during the 10\/1000us pulse raising the junction temperature to near its limit.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>
      1<\/td>Anode<\/td>Terminal<\/td>Terminal 1 (bidirectional)<\/td><\/tr>
      2<\/td>Cathode<\/td>Terminal<\/td>Terminal 2 (bidirectional)<\/td><\/tr><\/table>","application_scenarios":"
      • 24V industrial power rail protection against IEC 61000-4-5 surge (600W)<\/li>
      • RS-485 bus bidirectional ESD\/surge protection with 33V standoff<\/li>
      • 28V automotive accessory power load dump protection<\/li>
      • PLC analog input channel bidirectional transient protection<\/li><\/ul>","alternative_models":"
        Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>
        Littelfuse<\/td>SMBJ33CA<\/td>SMB<\/td>Same specs, larger SMB package<\/td><\/tr>
        onsemi<\/td>SMAJ33CA<\/td>SMA<\/td>Pin-compatible equivalent<\/td><\/tr>
        Bourns<\/td>SMAJ33CA<\/td>SMA<\/td>Pin-compatible equivalent<\/td><\/tr>
        Littelfuse<\/td>SMAJ33A<\/td>SMA<\/td>Unidirectional version<\/td><\/tr>
        Littelfuse<\/td>SMAJ30CA<\/td>SMA<\/td>30V version for 24V rails<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/posts\/6892","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/comments?post=6892"}],"version-history":[{"count":0,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/posts\/6892\/revisions"}],"wp:attachment":[{"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/media?parent=6892"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/categories?post=6892"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/tags?post=6892"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=6892"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}